Yesterday I was trying to add a large directory of files to Subversion. I tried it my usual way, via Subclipse, and got this error: can't open .svn\tmp\tempfile.tmp: access is denied Then I tried with Tortoise. Same thing. I piddled for a bit, with no luck. Off to google I goes, and then I came across this thread on the tortoise list. No need to read it... the bottom line is that the Tortoise folks are blaming McAfee Antivirus for the problem. It just so happens, we use McAfee at work. And, naturally, it's locked down so that I can't do anything about it. Fortunately, our "network guy" here in the office is the model of pragmatism. He works extremely well with us... in short, he's the antithesis of Dilbert's Mordac, the "we will authenticate you by the sound of your scream" IT security dude. So I says to my network guy, "Can you disable McAfee for me so that I can confirm this is the problem". He does so. I try committing the files, and bam, they commit. So, if you're getting that error, your antivirus software may be to blame.