Tickets missing E-Mail Content

I'm having a problem with version 2.4.1 (although it could be in other versions since this is my first) where the ticket view is not displaying the full content of some e-mails. The text is in the article table in the a_body field, but it's just not displaying in the ticket view (or the response.) Oddly enough, my e-mail signature is showing and it seems to be working properly for some e-mails. If it matters, I'm using IIS, IE7 as my browser, MSSQL and the affected e-mails in the database are showing as text/plain; charset="us-ascii". Some e-mails with this character set are showing properly. Would be appreciative for any help! <font color="black" face="Calibri" size="2">Key Travel is a full service TMC. So the next time you call with an enquiry, remember that you can book your complete travel itinerary in one go, from flight, rail and hotel bookings to visa lodging, car hire and airport parking. Ask your consultant for our full range of services.<BR> <font color=green face="Calibri" size="2">Think before you print</font><BR> <font color="black" face="Calibri" size="2"><b>DISCLAIMER</b> This email, along with any attachment/s, are intended for the named recipient only. If you have received it in error you have no authority to use, disclose, store or copy any of its contents and you should destroy it and inform the sender. Whilst this email and associated attachments will have been checked for known viruses whilst within Key Travel systems we can accept no responsibility once it has been sent. Communications on Key Travel's computer systems may be monitored and/or recorded to secure the effective operation of the system and for other lawful purposes. Registered UK Office: Key Travel Ltd, 28-32 Britannia Street, London WC1X 9JF. Company registration 1524302.</font>
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Matt Haynes