ive had this happen to me more times then i care to count. on the other hand i have made bad calls and sucked out something terrible!!!! i have also seen some bad beats in live play that put some of the online ones to shame. for example i saw one on you tube this morning involving pros at the final table of some tournament(i dont remember the details, i only point that out bc if you think thats rigged you should write a book, bc you are onto one hell of a scandal). the hand went with one having 10d Jd and the other having Qc Qd. the flop came 8d 9d Qs. both players check. the turn hits 9S giving player one the full house. she goes all in and he calls with his straight and flush draw. the river comes not only diamond but 7d giving him the straight flush and the pot. another example is just last night on the wsop event on espn hinkle went all in heads up with a slight chip lead on a bluff of 10 4. he gets called with A K. the flop comes 10 4 0 giving hinkle the full house and even worse the turn gave him the check with quad 10's!!!!! i guess my point is yes the sites could be rigged just like a casino could have a crooked dealer, but neither is very likely. so just take your losses on the chin and dont forget the last time you sucked out bc we all get lucky sometimes.
