Just installed Lightroom 5.5 along with other CC apps on a lab computer @ my community college in preparation for imaging the lab with this software.
All apps behave as expected but Lightroom will not start. If I watch in Task Manager I see lightroom.exe appear for just a second or two.
Please note that this is an enterprise licensed version so any suggestions to log out of Creative Cloud & log back in do not apply.
I've repaired the app, reinstalled it, generated a new installation package & reinstalled & nothing has made the slightest difference. There is no entry in Event Viewer indicating an application crash.