[imp] Failure to send a message

[Babita]

Hi, users are complaining that after hitting the 'Send' button often times 
they get a blank screen or a browser error page and the message does not 
get sent. The complaints started coming in around the same time we ugraded 
to Horde 3.1.5 & IMP 4.1.5. Has anybody else experienced something similar 
to this? Can anyone recommend some possible fixes?

Thanks.

--
Babita Rana
AICT
University of Alberta