Quote from: taiyo1578 at Sep 04, 2014, 02:48 PMThat's going to be very time intensive as I have modified many of the core files. I would really prefer to keep the current version if possible and figure out why all of a sudden I can't view or upload images.
Could you elaborate on those modifications? If they are to fix issues, it's possible they have been addressed in newer releases, or if they are feature related there might be a better way to implement them. Older version of MODX Evolution do NOT support newer PHP versions, so it's possible your sites will break if the host upgrades PHP. Additionally, there are some major security risks associated with running older versions.
In regards to the post upgrade issues you noted, I don't have any problems with QuickManager. It's possible you have some corruption in your upload, as it did work post upgrade for me. The white screen issue could also be related to corruption and/or a server error. Check your cPanel error logs.
@cristianb88's suggestion regarding permissions isn't bad, however you should use the correct permissions for your host. Typically, you would use 644/755 on shared hosting (files/folders). If you give them more permission ex: 777 it can cause 500 errors.
Check your browsers dev tools and watch the network activity, which should identify if that's the problem.