Chain hitting guide

[talljelly]

I put my rear wheel back on and now my chain hits my derailleur guide. The chain is on the small ring up front and the small ring in back. I have Shimano 105 components. I tried adjusting the B-screw but that didn't help at all. What am I doing wrong? I can take the derailleur and press back on it, which effectively raises the chain away from the rest of the derailleur.

[DaveM]

Did you change anything (new chain, etc.)? It could be that the chain is not the right length or that the spring in the derailleur got damaged. You normally wouldn't ride in the small-small combination. Are you fairly sure this wasn't happening before but you didn't notice?