Based on your description, you are likely using version 1.0.1 of CISmail. Version 1.0.2 of the software remedies the situation.
There is one way to tell which version of the software you have. Look at the "text stationery". If its size is 4 kilobytes, you have version 1.0.1. If its size is 5 kilobytes, you have version 1.0.2.
CISmail 1.0.1 sometimes miscalculates the vertical size of a message displayed with a large point font. Long sections of text may become cut off because the vertical arrows will not scroll far enough to display the bottom of the message. While using version 1.0.1 of the software, here is a workaround:
Workaround
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1) Open the In Box
2) Select CompuServe Prefs (from the "I" button).
3) Click on mail font button.
4) Choose either a 9 point, or 10 point font size.