[Zope] Is this a bug?

[Vizitiu, Ciprian]

Zope 2.5.1. on Linux (also produced on 2.6.0); Macromedia HomeSite 5 on XP. 

Open and edit some dtml via FTP. After several open/save opperations in
HomeSite you can no longer access the management interface with IE! Tested
with IE 5.x and 6.x on W2K/XP and IE on Mac. The page time-outs after a
while with the standard IE error message. It looks like the site is down.
The only way out of the problem is Mozilla/Netscape/Opera: You open the
management interface wo any problem at all; you have to go and open in the
web interface ALL the documents that have been edited through the ftp
interface and SAVE them. That's it! Double click the link and then press
Save. It apparently fixes the problem but it looks very scary. Is this a bug
or is there something wrong in my config?