I have just recently started having this same problem. I
noticed it after the recent virus/worm scare, after which
I installed a firewall and I am wondering if this has
created the problem?? Please let me know if you resolve
this problem.
Frontpage was being blocked by my McAfee Virus
protection/firewall. I went into the settings of McAfee
and gave Frontpage full access and I no longer experience
the problem you described...