Hi,
Thanks for the bug report. I was able to reproduce this bug on my local machine in a child site when using folder based child sites. The problem does not happen in the master site even when it does happen in the folder child sites in my testing, it also does not happen on our demo site using host name multi sites.
This will be fixed in the next release of mojoPortal and the fix will be in the source code repository as soon as possible, at the moment I'm having trouble pushing the change to the repository, hopefully the codeplex guys will have that sorted out soon.
Thanks,
Joe