Since FW version 1.4171 where it was fixed that Big number was displayed on remote desktop, on the #ultra screen when Big number is activated, when accessing the menu again it stops doing scans alternatively and sometimes, when unchecking big number or exiting the DISPLAY menu to go to another menu (for example, ?to change the frequency), the #ultra seems stops measuring.
It also happens if you give them the commands using the console commands. This video with the 30MHz Cal signal shows what happens:
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In the photos we see the same UHF C21 (saved by a console program on SDcard) working under FW 1.4170 and later
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Also, the characters are now larger than in FW 1.4170 and earlier, and now when the number is long, they don't all characters fit on the screen