I have had the same problem. After reading thru all of the posts here, I couldn't really see a pattern so I did some investigating.I was running 1.3 and was into Act IV when I upgraded to 1.4 with the EE download. I finished the game using 1.4 and started a new game with the EE version. I was mainly just interested in seeing what the differences were so I followed pretty much the same path as before except I chose to hook up with Shani instead of Triss. That was the only main sequence change and I pretty much finished all of the side quests along the way. When I got to the point where I needed to enter Radovid's Hideout, the door was locked. Bummer...After researching the problem a bit I decided to see if rolling back to version 1.3 would help. So, I restored version 1.3 by swapping game folders from a backup drive, not by reinstalling, and ran thru the sequence again. I loaded several version 1.4 saves, both before and after acquiring the seeing stone. In all cases, the door was locked even though I was running version 1.3. Even after getting the location from Triss, the door was locked.Next, I loaded similar saves from my first game. Although I finished the first game with version 1.4, I am positive that these saves were made in Act III using 1.3. After loading a save that was made right before acquiring the seeing stone, I could enter Radovid's Hideout, no problem. The house was labeled as Radovid's Hideout going in but Radovid was not there. After acquiring the seeing stone but before talking to Triss to get the location of the house, I could enter the house, Radovid was there and I spoke to him. I got all of the dialog that I would have gotten if I had talked to Triss first EXCEPT for the one option concerning Adda, for some reason. Also, I did not get credit for completing the quest even though I had spoken to him. I then went to Triss' house and got the "Triss Helps" step, went back to the hideout, spoke to Radovid again and got all of the dialog options this time and got credit for advancing the quest. Bottom line, nothing I could do under 1.3 with a save from 1.3 would cause the door to be locked any time during the sequence of events.Finally, I decided to take the direct route. I restored version 1.4 and started fresh. This time I used a trainer to max Geralt's skills and stats from the start to cut down on the time investment and I stuck to the primary quests alone with only a couple of exceptions. This time the hideout door was always locked right up until I acquired the seeing stone but, after I had it, the game played much like it did under version 1.3. After getting the stone but before talking to Triss, the door was not locked. Like with the 1.3 sequence, I could enter and speak to Radovid but, unlike the 1.3 result, I DID get the Adda dialog option AND I got credit for advancing the quest. Consequently, after speaking to Radovid prematurely, I went to Triss to get the location of the house but she never offered that dialog option because I had already gotten credit for completing the quest.My conclusion is that there is clearly a bug in version 1.4 caused by something related to a side quest. If it's something that happens, doesn't happen or the order of completion, I have no clue. One thing for sure, the primary quests did not offer a key of any kind. Because I only did a couple of the side quests that were designed to help advance the plot and because neither of these offered any key, there would be no way for me to NOT get the "key" in my previous game with version 1.4 because I had completed all of the primary quests in that game as well. The only difference between the version 1.4 game that lead to a lock out and the one that let me into the hideout was the fact that I did far fewer side quests in the game that let me in.One other bug possibility would be the order in which the primary quests are completed. I stuck pretty closely to the directions given by each completed step while playing both version 1.4 games, so I doubt if that's the problem. Still, it remains a possibility.... ]:-> it's a bug...