This is DTConverGUI on AROS One x86 v1.6
No that in your screenshot is not AROS One x86 v1.6, but a very old version AROS One x86 v1.2, AROS One v1.6 you can find it
HEREAs you can see the User Interface looks just fine. Font is Arial 14.
Yes even Font Arial 15 works well because they are small fonts, see screenshot, if you increase to 16 you'll see that the GUI breaks down, Arial 14 however is forced because it doesn't really exist.
I would have tested it with some picture files but AROS One wouldn't let me copy from USB Flash.
This is very strange maybe it's a VirtualBox configuration problem, it works fine for me !
It's about DTConv/DTConertGUI on AROS 68k the JPG format doesn't work it creates only 0 Byte files