Hi Kerry,
thanks for your post. I really appreciate your feedback!
That friend must be JM and she has already posted about her problem at http://wordpress.org/support/topic/dont-download-has-base-64-integrated-in-the-defaultmincss , and I will gladly work with her and you to resolve her problems.
I'm very sorry to hear that she was affected by this and that it caused so much trouble. As already mentioned in the forums thread that she opened, there's nothing to worry about in regard to that base64 call. It's not a security problem or something like that in any way. It's just a way that's used in modern webdesign to directly embed resources (for examples images or font files in this case) directly into a CSS file.
I know that there are security plugins that simply check for "base64" in a file, but unfortunately, they tend to forget that there are regular use cases for this.
Regarding the problem with deleting the plugin: I'm quite sure that this was not caused by TablePress, as the entire delete process is solely performed by WordPress, with no interaction whatsoever by TablePress. I'll explain that in more detail in the other thread shortly.
Regards,
Tobias