I had a problem like this YEARS ago (when I was an OFP n00b). This may be a diff prob, but im just trying to help. I found that if you reinstall flashpoint when there is still an older flashpoint directory present (even if there are no files or anything in it) it adds (or takes away, depends on ur current folder name) the space between "Operation" and "Flashpoint". Maybe the folder your putting your addons into is the older one and you need to put it into the one with/out the space between operation and flashpoint. Sorry if that doesn't help, best I can think of.