(From the PM-WIN discussion list)
Folks,
I recently activate IERenderer because of "phantom links" in some messages I get. Martin Ireland is already informed and is working in this CSS3 "problem", and shall come with a solution very soon.
Anyway, as BearHTML had troubles showing the links I turned IERenderer ON to render those messages. Though it did render the links properly it failed to show two PNG graphics of the message. Opening the message on IE also didn't work, so I realize it could be on message code post-IERenderer processing.
Looking into it I found that graphics were referenced as this:
C:\Documents%20and%20Settings\German\Application%20Data\Pegasus%20Mail\ImageCache\german\130CD70DB1EC38B761D2F632EEA3AC0A
The image was properly shown when the above file was opened using IrfanView, only it warned me that it was a PNG and asked me if I want to have it renamed to 130CD70DB1EC38B761D2F632EEA3AC0A.PNG which I declined.
Looking IERenderer settings I saw this path is the default path for cached graphics. By that time I already have checked every IE setting after some wrong configuration but it was all there. On other sites IE has no problem rendering graphics, only on IERenderer messages, and only graphics (e.g. PNGs, JPGs, etc.) CSS (including CSS3) seemed OK.
So I thought the path to the cache directory could be too long or those spaces (%20) could over-complicate, so I changed it to a C:\Temp directory, and bingo! The problematic message rendered out perfectly!
I don't know if any of you had (or still have) this sort of problem, but I thought my findings could help you get a better HTML rendered message (using IERenderer). Maybe it is not that ugly as it looks. 