Yet again I have the same problem as you. Even without the plugins enabled i get the same error yet again. I'm happy at least that this isn't related to memory corruption and I might lost my memory card.
dooceswild dude, you are not the only one having the same error with the same apps. I have a similar configuration on my vita (except the nonpdrm plugin) and since yesterday that I tried to use either VHBB or the PSN store I get the same error as you. I thought it was corruption problem on my SD...