In VRoid Studio v0.6.0 and later versions, it has been reported that once selected, items sometimes move on their own and don't work properly. This may be caused by a USB device connected to the PC, causing the up and down keys to be operated unintentionally.
You can fix the issue as follows.
- Check that the joypad or virtual joystick software is connected and enabled on your PC.
- Remove each USB device, disable them, and check VRoid Studio again.
Since v0.6.0, the UI system has been updated to allow movement using the up and down keys. Currently, the issue where the up and down keys are operated unintentionally occurs on some devices when using the Unity app.
For reference, a problem with a 3DConnexion driver has been reported on the Microsoft forum. Uninstalling the affected driver resolved the issue. As for virtual joystick software, an issue has been reported with the Vjoy software. Similarly, disabling the affected driver has solved the problem.
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This problem does not occur with most mice and keyboards. If you experience the same issue with your device, please contact the device's manufacturer and software developer and report it to them.