Another update: E-mail received from support to confirm that the issue is still under investigation.
I am now using TortoiseSVN 1.7.4, Build 22459 - 64 Bit , 2012/01/13 12:57:07 and the problem remains. -- You received this message because you are subscribed to the Google Groups "VisualSVN" group. To post to this group, send email to visualsvn@googlegroups.com. To unsubscribe from this group, send email to visualsvn+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/visualsvn?hl=en.