All files, or just the one? For all files, see Troubleshooting 101: Replace, or "trash" your InDesign preferences, for just this one file, see Troubleshooting 101: Export to .idml or .inx to clear file corruption
It's all files. I just trashed my design preferences and it's still doing the same thing. No difference. I went ahead and re-exported to .idml file and no difference. Any other suggestions? I'm 95% through with this project and I can't finish because the program is haywire.
ETA: I just trashed all my InDesign preferences a second time and them opened up the idml file in the fresh program and no change still.
ETA2: I don't know if this makes a difference, but I am running Mac OS X Yosemite version 10.10.2 and I upgraded to InDesign CC 2015 (18.104.22.168) today, although the trouble started prior to the latest upgrade.
Do you use any non-adobe plugins (including a font manager) in ID? How about browser plugins in Chrome?
I do not remember installing any plugins in InDesign--I have had CC for about a year and, as far as I remember, use it as it was downloaded.
As for Chrome, I had to look up how to find what plugins (versus extensions) were installed. Here are the plugins that are installed:
Widevine Content Decryption Module - Version: 22.214.171.1244
Chrome PDF Viewer
Chrome Remote Desktop Viewer
Adobe Flash Player
I don't remember installing these specifically--I think they came with the bundle download, but I'm not sure.
Thank you for your help!
Either the import plugin became corrupted of is missing. Open the CC Desktop application and unistall from there InDesign and install it again.
Or, it would do the same, change the language of the CC app (preferences), so you can install InDesign with a different language, which will complete missing components and change back to your primary language. InDesign chooses the UI according the OS language if available, so the second installing doesn't make a difference, except that it would enable you to run it in another UI.