Secured WebDAV Mounted Volume Authorization Issues

Question

I use a secure WebDAV mounted volume from myDisk.se and up until the latest Security Update have had zero issues being able to manipulate files and folders as I would on a normal volume. However, since the installation of the Security Update (2009-004 (PowerPC) 1.0) I find weird things happening with this mounted volume:
1) I am able to mount the secured WebDAV share using my security credentials.
2) I can create a default "untitled" folder but when I try to change its name, the WebDAV authorization dialog pops up and despite entering the same credentials (why, I am not sure as the volume has already been properly credentialed in order to be mounted), access is denied.
3) Trying to create a file within a folder on the mounted WebDAV volume I previously created pre-update causes the same authorization issue.
I have no other WebDAV shares I can try to mount from any other companies so I am not sure if this is a myDisk issue or one borne from the Security Update. I am not a .Mac/MobileMe user and that info is not filled out in System Preferences. The internal hard drive has been meticulously maintained with Disk and Permissions repair being run both before and after each and every software update installed. Likewise, the volume's structure is also checked both before and after and shows no need for repairs.
Any ideas? Perhaps there is a corrupted file somewhere that's affecting the authorizations needed by this third-party WebDAV volume?
The machine that has this problem is the last model iBook G4/1.33GHz 12" display, 1.5GB RAM, and a 100GB 5400rpm HD which replaced the stock OEM 40GB 4200rpm drive about one year ago.
I'm not willing to do an Archive and Install at this point as the loss of the WebDAV access to my online volume is not critical. Inconvenient as heck but not to the point where I'm willing (or able) stop my normal work to spend the hours it will take to get WebDAV access back.
Thanks in advance for any insights.

Answer 1

same problem here with webdav, I can't mount my idisk from university network on Mac Pro 10.5.3 (although it mounts fine from home network on both ibook and PMG5 10.5.3). Everything was fine with 10.5.2 and I already re-installed 10.5.3 combo. Other bugs as well with .Mac prefs (keeps crashing, sometimes it shows the available space on idisk but still no mounting, with error -35 or -8086), but .Mac sync is OK
Jun 11 12:34:21 webdavfs_agent[579]: mounting as authenticated user
Jun 11 12:34:22 kernel[0]: webdav server: http://idisk.mac.com/[username]/: connection is dead
Jun 11 12:34:22 KernelEventAgent[75]: tid 00000000 received VQ_DEAD event (32)
Jun 11 12:34:22 kernel[0]: webdav_sendmsg: sock_connect() = 61
Jun 11 12:34:22 KernelEventAgent[75]: tid 00000000 type 'webdav', mounted on '/Volumes/[username]', from 'http://idisk.mac.com/[username]/', dead
Jun 11 12:34:22 kernel[0]: webdav_sendmsg: sock_connect() = 61
Jun 11 12:34:22 KernelEventAgent[75]: tid 00000000 found 1 filesystem(s) with problem(s)
Jun 11 12:34:22 kernel[0]: webdav_sendmsg: sock_connect() = 61
Jun 11 12:34:52: --- last message repeated 1 time ---