cutechat:
when you get such error , can you check whether the C:/xampplite/tmp/uploadertemp/persisted.a1b3aa86-eb12-4941-b1d0-675b4515c2c6.twitter_logo.jpg.resx exists or not ?
Yes, the file does exist.
cutechat: Do you use SaveDirectory property ?
No, I do not.
FYI, I have PHP 5.1.6 on my dedicated server, and file uploads work fine via that machine. But on my local development desktop where this error is occurring, I use PHP 5.3.0. That's about the only difference that I know of offhand.