Finder and Dock issues in OSX 10.10.1

I have been having issues with Finder and the Dock ever since the upgrade to 10.10.1 (I can't be certain they weren't there in 10.10).

I am unable to drag items off of the Dock (to remove them). I also can't drag items from the download stack that I have beside my trash can in the dock. Dragging the item simply does nothing. If I drag it somewhere and release the mouse button, it just opens the app/file.

And in Finder, I am only able to drag and move/copy 86 items. I can select more but when I drag them to a new folder or other location the most that will get moved is 86.

I have confirmed the issue with a friend but have several other friends for which everything is working fine.

I have a mid 2012 retina MBP and my friend has an older (2010 i think) non retina MBP. I have restarted several times and tried to find any sort of setting that might be turned off. Googling doesn't seem to turn up any information either. So I am mostly wondering if anyone else is having this issue and/or if it is an OSX bug or how to fix it.

Thanks.

Update

Running repair disk permissions from disk utility then restarting worked for a while. But then things went right back to not working again. Going to test some things to see what might be causing it to revert.

Update 2

It turns out that restarting does fix it temporarily and repair permissions has nothing to do with it. I am assuming I didn't notice this before because it is being caused by an application that was reopening (because I usually check off the "Reopen applications" option).