I don't know if this is the same problem that I was having or not, but I found out that the system was adding in br tags after each line of code for a table. I ended up having to eliminate all whitespace in the code for the table so that it's all one chunk.
Guys, this is not a DT Register issue. If you have HTML code being dropped or modified, it is due to your wysiwyg editor. DT Reg doesn't modify your messages... ever. Make sure you are using a good editor like JCE then check your editor configuration.