
1)Unable to load notecard/object contents. I dont know a workaround and it is SO annoying!
2)Stuck between sims or outside the map, unable to teleport, having to relog.(Actually I have a vague recollection of using the sit here bug to escape it, but i could be wrong)
3)Unable to remove attachments, having to relog.
4)Objects and avatars being seen without being present - ghosts. Fixing requires relogging.
5)Objects consistently go phantom near the sim border making me get stuck inside buildings or fall through the floor.
6)Tracker lag. I dont know how often the tracker is updating but it always indicates that people are at the edge of a sim, when they arent. the other day the tracker had the nerve to tell me that a person was over 16000 meters away(and counting), when she wasnt, and I managed to find her only by asking about her location through IM.
7)Pathfinding AI sucks in auto fly, seems to think in 2D and does not want to go around objects. Could be "fixed" in 5 minutes by just making auto fly take us to 200 meters altitude first, where its usually pretty empty.

9)You buy a texture pack with 250 textures and then have the pleasure of pulling them out one by one for hours.
10)The coordinates of an object fluctuate randomly. While shift dragging with snap to grid a while ago, I didnt get all the decimal places remaining at 0, and instead got a mysterious excess in displacement.
11)Hollow cut cubes and their annoyingly sharp edges, and nearly untexturable innards.
12)Flashing textures in overlapping prims. Amazingly this can even happen if their surfaces arent precisely coinciding.
13)Seams between prims that are aligned with mathematical perfection.
14)Overpowered, abusive objects that throw me to the other side of the world, or instantly teleport me home without my permission, or follow me around banging into me and making it impossible to move right etc.
I read something in a past release note about fixing things like these, but my trusty old baseball bat still throws people across a sim or two.
15)Neighbour discounts, as mentioned recently in another thread.
16)The whole economy and rating system as has been talked about ad nauseum in just about every forum

17)The "sit here" bug
1

19)Being able to look inside people's houses and hear what they say - inexistent privacy. Also the easy tracking and recording of people's movements and the long-distance retransmission of captured chats to a spy player.
20)Inexistent anonymity.I would love to make anonymous donations in the true spirit of charity and also would love to not have my name plastered on everything i have made even after it goes public. There is no problem with abuse and it seems simple to implement. Just display "anonymous" for players and the real name for lindens in objects flagged as anonymous.
How am I supposed to make a st. valentine's card for all my 300 sweeties eh?

Bonus bug... I could swear I lost money the other day when me and baccara claimed and released the same object multiple times. She got all her money back when she deleted the object she rezzed but I think I came short by about 24 dollars... doesnt break the bank, but still, it is most intriguing.