I've given up on MIUI for SGS2. Week after week the same bugs and no new base for months. I flashed stock 4.0.4 and its so much quicker, I didn't realise it until I went back on MIUI last weekend. After a few days I had to go back to 4.0.4. I wish they would concentrate more on bug fixes and...
SGS2 won't see JB till Q4 and even then it will be a few weeks at least till MIUI use it. We could be waiting till next year. So yes they should bother with 4.0.4.
I'm beginning to think SGS2 isn't even being worked on, we have had the same bugs list for weeks!
For me I noticed it on a custom theme so I flashed back to stock and it was fine again (It wasn't the theme icon because I checked). After some messing around I found that sometimes it would even do it on stock theme to. I'm using black town theme at the moment and the H icon is working fine.