Wireshark-users: Re: [Wireshark-users] files fail to close
>>> "Dey, Anthony" <[email protected]> 09/16/09 2:35 PM >>>
> Has anyone experiences a similar problem when running a capture with the
> settings below.  None of the files close after reaching  20 MB. And the
> pop-up closing file! Please wait... does not go away.
> I am running the latest wireshark release 1.2.2.

Sounds like Wireshark bug 3046

   https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3046

One workaround I've found for this problem is to disable the 
"Update list of packets in real time" option IF the "Use multiple files" 
option is enabled.

I hope this helps,

Jim Y.