Blank windows.

OK, Im fishing,- since I dont know what has happened.
I just had my Comcast modem changed.
Everything SEEMS to be working fine, EXCEPT for EXMH (sigh).
It has been working fine for years, up to the modem change...
Now, the EXMH window comes up, it shows the folders that have mail,
and counts the number of messages correctly.
BUT if you click on a folder with mail, nothing happens.
The subject lines do not display, nor does the text of the message.
Help mesages do come up so its not a complete loss of fonts.

PLEASE, this must be simple, can anyone give me a pointer?
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                                        Reg.Clemens
                                        [email protected]