Format SDX stock 1050 weird bug?

Hi

Tried SDX 4.46 with both AtariMax 8Mbit cart and MyIDE ][ cart. Same issue.

This is on stock atari 130XE, with stock 1050.

1. I switch on atari 130XE
2. SDX starts properly
3. I insert new floppy disk in D1: 1050 (stock drive, no happy)
4. I type FORMAT
5. I setup: Unit 1 (A:), I hit F (format),I hit RETURN
6. Drive starts formatting
7. As soon as format is finished a scrambled screen, and hitting ESC results in font up side down.

I tried with AtariMax 8Mbit flash card, and with MyIDE ][ cart. Both result in same problem.
Am I doing something wrong?

Thanks
M.

p.s. with Happy 1050 no issue.