Incorrect field names after upgrading (LBL_PROJ_EST instead of Project Estimate)

Hi, after performing an upgrade to the most recent stable version, many field names in many modules are not displaying properly. It looks like they are displaying the internal label, not the display label. For example in the project module these fields are not displayed properly IN ALL VIEWS (edit, detail, etc):

LBL_PROJ_TYPE displayed instead of Project Type
LBL_PROJ_EST displayed instead of Project Estimate
LBL_PROJ_ACTUA displayed instead of Project Actual

I have already done a repair and rebuild and that did not fix it. None of these fields were customized or altered in the source code. Any help would be appreciated.