There are number of things currently. I am not entirely sure is it service update or forum updates that may have caused it. If you try to use "embedded links", they may not work and will give you server error message when you try to post. This applies to linking websites etc, but also if you cut & paste youtube embed video code, it will most likely cause error. Youtube links should be done with forums youtube tool that is located above message.
I noticed that even having word "video", "videolla" or such in text itself, sometimes causes error. Not always, but in some sentences. Simply removing one word or writing it "v i d e o" makes posting work.
These are small anomalies and will look into possibilities of fixing the bug at some point. If someone encourters problem in posting, just remember that no embed links, just post link as is. If there are no links, check out words above that may be somehow detected as such.
