A few points:
CS5.5 is unsupported under Yosemite.
Adobe applications do very poorly when migrated. Only a proper installation will work. If you uninstalled did you run the cleaner tool before reinstalling?
Because of the first point, I’m afraid you’re on your own here.
- CS5.x is not compatible to Yosemite. It may or may not run, if it does never without problems.
- Adobe applications should never be installed via migration. It is always making problems in the long run. If you have done so, deinstall them immediately, run Adobe's Creative Cloud Cleaner Tool (available on Adobe's Website) and install any application from it original installer.
- I recommend to upgrade to a CC subscription. CS6 might also work, but it is now very old and 2 to 3 versions after CS6 have been released. If you get a new system upgrade it is NOT guaranteed that it will work as CS6 is now at the end if not out of its product life cycle.