Missing menu-open buttons

I just upgraded to the 4.2.1 beta and suddenly the arrow buttons used to open menus are gone. Instead, there is just blank space and no button, so there is no way to expand menus on the taskbar. Nothing has been changed besides doing the upgrade. "Show arrow on menu button" is checked, and I have tried everything including deleting the toolbars and remaking them. Is there an easy way to revert back to v4.2?

Btw, I'm on windows XP.

Is there an easy way to revert back to v4.2?

Uninstall 4.2.1 and install v4.2. Other way: delete tlb.dll and install v4.2

Please can you send me (<!-- e --><a href="mailtoupport@truelaunchbar.com">support@truelaunchbar.com</a><!-- e -->) the backup of your toolbar and the screenshot of the invalid menus.

I sent you a screenshot and toolbar backup file. Btw, I fixed it by uninstalling and reinstalling 4.2, so it definitely seems to be a beta bug.

Thank you very much for backup file. I've reproduced this bug. In the next version this bug will be fixed.