Important note:

The TortoiseSVN client version 1.4 uses a different working copy format than the 1.3 version.

I use Subclipse in Flex Builder to refer to the same local working copies of my code and commit/update using both tools frequently. Committing using Subclipse broke this morning due to an upgrade I did on Tortoise last Friday. causing the local working copies to be updated with the new format.

So...be careful. I'll just have to use Tortoise exclusively until Subclipse gets updated.