When a trigger is saved, Toad is adding the owner name to the front of the trigger name as the file saved in VSS. This is then resulting in inconsistencies between VCS version and database version in an attempt to reload the object or check it out. Viewing the differences shows that the only difference is in the trigger name in VCS having the owner/schema name in front of it. However, whenever it is set to "Yes" to reload object from database and chose VCS version it asks again.
Enhancement request ER 33751 has been submitted to Development for consideration in a future release of Toad for Oracle.