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Yesterday I found that RealURL does not work with ve_guestbook. The problem is that RealURL only partially includes parameters leaving most of them in query string.
After close look I noticed that some parameters are missing closing square bracket. For example, if parameter should look like aaa[bbb[ccc]] it actually look like aaa[bbb[ccc]. After doing reserach I found that parse_url returns it like this, thus RealURL could parse it properly. I am not sure if it is specific to PHP 5.1.8 that I use locally. In any case I made a workaround in RealURL and commited it to CVS. It will work in both cases: when parse_url works properly and improperly. Now I use RealURL with ve_guestbook as well :)
