Miche bottom bracket slippage?

Just been for a ride through the city centre (Manchester, not London) and had a bit of a weird rear wheel lock-up when skidding to a stop. Chain was real slack, looks like the rear wheel has slipped in the dropouts and moved forward, no real biggy.

Problem is now my drive side crank arm is scrubbing my chainstay. Previous to this incident there was a 2-3mm gap between the crank arm and the stay with a similar distance on the non drive side.

As i have a Miche BB, one of the ones with adjustable cups, when i set the chainline up the bb cup extended a couple of mm out of the bb shell drive side with the nondrive side cup sitting a couple of mm inside the bb shell.

it now looks as though the whole bb (ie the cups on both sides) have shifted towards the nondrive side a few mm, making my crank arm scrub. looking at the bb it seems as though the driveside cup isn't sticking out as much as it previously was, although this is just guessing as i can't clearly remember.

Anyone aware of this happening previously or is this even possible given the thread directions on the shell?

Trying to think about it in my head but can't remember which way the bb screws on each side. If it has slipped i would definitely be looking into replacing the bb with one with non-adjustable cups to prevent this happening again.

Is it English or Italian threading?

There has been discussion here previously about Italian Mickeys undoing.

Never heard of the whole BB wandering left though....

Plumbers tape on the threads pre-installation (or on re-installation) should stop the bugger unscrewing itself.

Check frame alignment.

Electrical tape does work, your best bet may be to try a little lock-tight on the threads. It normally makes my BB cups stay in place months longer than they normally would. You may also want to take a look at your chain-line next time you put in your BB.

Is it English or Italian threading?

There has been discussion here previously about Italian Mickeys undoing.

Never heard of the whole BB wandering left though....

think it's english threading as it's a dolan frame...

Check frame alignment.

is me skidding likely to cause the frame to go out of alignment? would've thought some kind of collision or serious force would be involved to cause that?!

Electrical tape does work, your best bet may be to try a little lock-tight on the threads. It normally makes my BB cups stay in place months longer than they normally would. You may also want to take a look at your chain-line next time you put in your BB.
chainline seemed bang on when i installed it, hence why the bb was sitting a few mm out of the shell drive side. will use some loctite when i realign it tomorrow, hopefully that'll stop it re-ocurring

The only time I've pulled the wheel round in the track ends is through accelerating rather than skidding, so I'm not sure what's happened there. I guess the non drive side could have slipped rearwards in a skid causing the same effect. Frame alignment changing on it's own is pretty unlikely (!) - where do you lock it up etc?. It's just something I would check as it's more likely someones had a go at your bike than the BB has moved inwards on the drive side against the opposing thread of the other cup.