What do you need?
Situation | What to do |
The Start button is grey | It becomes active 5 minutes before the lesson, but only after you refresh the page. |
Error 500 / 504, "lesson not available" or the lesson won't start | It may be a platform outage. See "Platform outage" – don't refresh again and again. |
My camera or microphone doesn't work | Follow "Quick fixes". |
Black or blank screen in the classroom | Turn off hardware acceleration (see "Advanced fixes"). |
My internet dropped | Switch to your phone's hotspot and rejoin. Then close the lesson as usual. |
My student can't hear me, can't join or has no camera | Send them the messages from "Help your student". |
The whiteboard doesn't work | It's almost always a browser extension or setting. See "Whiteboard not working". |
Nothing helps and I can't teach | Write to us in the chat with screenshots of the tests (see "Still not working?"). |
Before the lesson
Use Google Chrome or Microsoft Edge. Other browsers are not supported.
The Start button becomes active 5 minutes before the lesson. It doesn't turn active by itself – refresh the page to see it.
Close Zoom, Teams, Skype and Discord – they can block your camera and microphone.
Quick fixes (try these first)
Restart & Rejoin: Restart your device and rejoin the session immediately.
Close background apps: Completely shut down any applications that might be hijacking your hardware (Zoom, Microsoft Teams, Skype, Discord).
Check Browser Permissions: Click the padlock icon in your browser's address bar (next to the URL) and set access to Camera and Microphone to "Allow".
Incognito Mode: Try opening the session in a Private/Incognito window. This automatically disables extensions like AdBlockers, VPNs, or antivirus add-ons that might block the stream.
Bluetooth Check: If using wireless headphones, ensure they are connected to your computer and haven't accidentally paired with your phone.
Physical Buttons: Check if your laptop has a physical camera shutter closed, or if your headset cable has a manual "Mute" switch turned on.
Classroom and browser settings
Supported Browsers: Use Google Chrome or Microsoft Edge only (other browsers are not supported).
In-App Settings: Open the classroom settings by clicking the grey cogwheel icon in the bottom-left corner to verify that the correct camera, microphone, and headset are selected.
System Permissions: Check your OS (Windows/Mac) privacy settings to confirm that Google Chrome or Microsoft Edge has permission to access your hardware.
Advanced fixes
Turn off Hardware Acceleration (Black Screen fix): Go to your browser settings (Chrome/Edge) -> System -> Turn off "Use hardware acceleration when available" and relaunch.
Disable Exclusive Mode (Windows Audio fix): Go to Windows Sound Control Panel -> Recording -> Microphone Properties -> Advanced -> Uncheck "Allow applications to take exclusive control of this device".
Switch to Mobile Hotspot: If your home Wi-Fi is unstable, quickly switch to your phone's mobile hotspot to restore the connection.
Platform outage
If you see error 500 or 504, "lesson not available", or the lesson won't start for you and your students, the platform may be down. Our technical team is usually already working on it.
Wait 5 minutes, then refresh the page once.
If the lesson still doesn't start, wait another 3–4 minutes and refresh one more time.
Don't refresh again and again – it overloads the system and slows down the fix.
If you still can't start the lesson, write to us in the chat with a screenshot of the error.
After the outage: you don't need to cancel the lesson or write to us. The next day, once the outage is fixed, we set these lessons to Cancelled. You are still paid: the amount for the lesson appears in your Salary tab as an Extra payment. Students are not charged for these lessons.
Whiteboard not working
The whiteboard itself works – problems almost always come from the browser. Try these steps in order:
Refresh the classroom and open the whiteboard again.
Open the lesson in an Incognito / Private window. This turns off all extensions. If the whiteboard works there, one of your extensions is blocking it.
Turn off extensions one by one, starting with ad blockers (AdBlock, uBlock), Grammarly, dark-mode, translation and screen-annotation extensions. Then refresh.
Set the browser zoom to 100% (Ctrl + 0, on Mac Cmd + 0). If the zoom is different, your drawing can appear in the wrong place.
Clear the browser cache: press Ctrl + Shift + Delete (on Mac Cmd + Shift + Delete), select "Cached images and files" and confirm. Then refresh.
Board is blank, frozen or lags: turn off hardware acceleration (see "Advanced fixes") and restart the browser.
Update Chrome or Edge to the latest version, or try the other of the two browsers.
How to use the whiteboard tools is explained in Fluentbe Presentations.
Help your student
If your student can't hear or see you, or can't join:
Send them one of the messages below in Messages.
Wait in the classroom until the scheduled end – if the student doesn't manage to join, it counts as a no-show and you are paid.
If the student has a problem every lesson, ask them to write to [email protected].
Ready-to-send messages for your student
[ZOSTAW: obecne 3 szablony PL/ENG (odśwież / zamknij Zoom-Teams-Skype / tryb Incognito). Dopisz te dwa:]
Check browser permissions: "Please click the padlock icon next to the address bar and set Camera and Microphone to Allow, then refresh the page." / PL: "Kliknij ikonę kłódki obok paska adresu, ustaw Kamerę i Mikrofon na „Zezwalaj” i odśwież stronę."
Use Chrome or Edge: "Please join the lesson in Google Chrome or Microsoft Edge – other browsers may not work." / PL: "Dołącz proszę do lekcji w Google Chrome lub Microsoft Edge – inne przeglądarki mogą nie działać."
Still not working?
Run these tests and send screenshots of the results to us in the chat, with the lesson date and time:
Nothing works and you can't teach the lesson? Write to us in the chat straight away and ask your students to call our office: +48 22 307 11 71.