For Bilge Dice, yes, it is a "known issue". Neopets took the game down at, or a little after Neopets changed from being owned by Nickelodeon to JumpStart, in 2014. When they moved Neopets to new servers, there was an issue with Bilge Dice. The game was taken down for "maintenance", but, to this day, it has not been fixed. It seems there was a "glitch", and players were able to take advantage of it. (At least, that's what I "heard"). The belief is that it (fix Bilge Dice) was put on TNT's "to-do list", but, like many things during the 2014 server transition, it was either low priority, or "something we will get to", but never gotten to. Best we can hope for, is that Bilge Dice will be remade in HTML5.
As far as Attack of the Slorgs, which browser are you using? Internet Explorer had a bad habit of the game "freezing", usually after completing several levels. At that point, all you can do is restart the game. All progress is lost, along with your score. Not fun. If you use Chrome, with the "IE Tab" extension, it can do the same thing - "freeze", after playing several levels. As "IE Tab" uses Internet Explorer, Chrome can suffer the same fate. It's been a long time, but IIRC, the game either didn't freeze, or freeze as much, when using the last version of Safari for Windows.
Also, which version of Shockwave are you using? Not sure if it makes a difference for AoTS, but I use version 10.3.1.018. When I was playing AoTS to get the avatar, I was using version 12. Using an older version may help, like it does for the "Hannah" games. I do remember, too, having to refresh the game page, several times, to get AoTS to load. (Like, A LOT).