Already applied a jailbreak once, and had not big problems but now I'm quite lost...
1. Edit: Problem solved...
2. problem: Wanted to install Winterboard, but it say "Cannot Comply".
It appears as if it depends on preferenceloader (smth I can't find), and libhide >=2.0.4 (yet again smth I can't find)
So yeah... Are those some common problems? Because I couldn't find any solution 'till now on google.
Diesel just give Cydia time or depending on where you are a firewall might be getting in your way. I JB my phone yesterday and I had the exact problems the OP describes. I didn't have an answer and it was almost time to go home so I just didn't worry about it and went home. Then later in the night I opened Cydia and bam everything was fine. I loaded all my apps and no error like before. Sometimes Cydia gets hammered by the initial rush but as it subsides everything goes back to normal.