In View->Show panels I can check and un-check the panel selection, but it makes no difference, nothing happens.
Instead, 2 drop boxes have appeared where I can select a class (in the left one), and a member function in the second one.
Not all project files are available in the selections, which makes it impossible to bring them up in the IDE and modify.
(Edit) Correction, you can do File->Load and display any project file. Also, if someone might be wondering, when trying to open a panel it's not the case that the edit window just needs to be moved out of the way, I tried that. When trying to open the project manager panel you can see the edit window twitch to the right about a mm, but nothing else happens.

I think it's begging me to be re-installed, but I can't figure out how. There does not seem to be an entry for DEV-C++ in the add/remove programs, and there is no uninstall exe in the DEV-C++ directory (that I can find). I know I have done this before, so I just can't remember (probably due to the frustration at this point).
Other problems (minor) are that the tools and properties panels have become un-docked, and the IDE will not allow me to dock them again on the right hand side (although they can be docked at the top).
Update: never mind, I just saved the projects folder, deleted the DEV-Cpp folder and ran CC Cleaner to clean up the registry.
I'm installing a fresh copy.