Weird problem - project not loading

Today i encountered a strange problem i could not fix so far.

i set up a subversion (SVN) repository for my project.

after playing around with some tile maps (and restarting TGB), my project would not load automatically, nor could i load it manually via "File" -> "Open Project", TGB was always loading the default project.

i deleted the project directory, created a new project in TGB using the same name - worked = TGB loaded the new (empty) project.

i then quit TGB, deleted the directory, did a checkout on SVN (so it created the whole project directory structure plus files from the repository) directly into Torque Game Builder\games\projectname, tried to start TGB - did not load (neither automatically nor manually).

debug console within TGB editor did not show any problems.

since ONLY the project directory files were different, i'm thinking there must be some problems with the files in the repository.

BUT get this:

after deleting the whole project directory again, creating a new project with the same name from TGB, quitting TGB, SVN check out to D:\temp\projectname, and manually copying the data, gamescripts, gui and managed from D:\temp to Torque Game Builder\games\projectname, it WORKED again??? (loading the project)

somehow this all started when i introduced a tile map to my project... no idea what happened, or why it's different to copy the files from another directory rather than directly checking out/update from the repository into the games directory.

i'm totally dumbstruck.

any ideas? any help is very much appreciated! ;-/

cheers,
thomas