Did you actually accomplish a preferences reset? In other words, did Photoshop prompt you to confirm deletion of your current preferences?
Dragging Photoshop to the trash is a very bad idea. It needs to be uninstalled. You may be right that your past moves are the reason for your problems.
Try the Adobe cleaner tool/process, then a reinstall:
Thanks a lot for the Cleaner.
I uninstalled Photoshop CC with the uninstaller, and I used the Cleaner to remove the only content left related to Photoshop CS (something like Photoshop 4 CS I..., I can't remember).
I then reinstalled Photoshop CC but yet I still have the message and no "Adobe Creative Cloud Cleaner Tool.log" file in my User folder as I should have, if I get what's written in the Read Me file.
However, the program I deleted with the cleaner isn't in the list anymore.
See something else ?
A Mac expert is going to have to weigh in here. My thoughts go to possible permissions problems, but I'm much more knowledgeable about PC things.
Best of luck; I hope you get it working.
I found this guide on the MacRumors site to be quite useful for general information on removing programs manually and thoroughly. http://guides.macrumors.com/Uninstalling_Applications_in_Mac_OS_X
I won't repeat the specifics here but those instructions worked for me in removing an anti-virus program (when I realized that I didn't really need it on a Mac) that didn't want to go away via the drag to trash option. It is certainly true that dragging to the trash does not remove everything although it works for smaller programs but certainly not any version of Photoshop.
The good thing is that at least there is no registry to wade into with OS X.
I did that already but it seems some files don't show up (and every image created with Photoshop appear, how annoying). I sorted them by type and application but nothing from Photoshop CS appeared (I have some files from PCF, AAMU Updater, AAMUpdaterInventory, I don't know if it's CS or CC related).
I found that (http://helpx.adobe.com/creative-suite/kb/manually-remove-creative-suite-1.html), I'm gonna give it a try and I come back to you later !