Fast User Switching-- Disk Access Error

I have created a Standard User Account with no Parental Controls. I have not had any problems whatsoever logging in to iVisit (video conferencing) as an Admin, but when I log into the Standard account, and try to log into iVisit (using the same log in information as my Admin account, and this is what iVisit suggests I can do) I get the following error message when I click the log in button:
Disk access error. Check free space and write permissions.
I've tried logging out of my Admin account first, then logging into the Standard account before I try iVisit, but that didn't work. I've opened up the Standard account as much as possible (I think) to remove any restrictions, and even selected the option to allow user to administer this computer, but that didn't work either.
Another piece to this puzzle, is that iVisit Help suggested that I install iVisit under the Standard User, just to be safe. But during the install process, the installer quits, and I get an error message that says it can't continue.
Does anybody know what's going on? I really appreciate any help! Thanks
Powerbook G4 1.33 Mhz   Mac OS X (10.4.3)   External OWC, 512 RAM, iSight

I don't know anything about iVisit, but it sounds like it may not be behaving exactly as an OS X installer should — placing files in spots that only admins can access. I would try this as a next step:
1. Uninstall iVisit.
2. Make your standard account an admin.
3. Try and install iVisit through the newly admin'd standard account. Hopefully this avoids the error/crash.
4. Confirm that iVisit works through this account.
5. Switch it back to a standard account and test again.
I don't know if this will fix your problem, but it's worth a shot and may help narrow down the cause of the problem.

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