Thanks so much, Tytanowy Janusz!
The error I received was:
'Order Failed... Price Must Be At Least $0.000001.'
I entered a price well above this - $0.0012 ETH - and I tried with CMT/ETH with below market prices and that pair is also giving me problems.
I tried with a Stop-Limit as well and it didn't work.
I tried with the Basic, Advanced, and the old interface - all three are giving me the same error message.
I even refreshed my browser (Chrome).
It's really odd. I've never had such an issue with Binance before.
And a few days ago, I tried with the same price on the same pair and it worked. I had to adjust my orders last night and it hasn't worked since.
i've check it on my account with your prices. It was ok. Try to report it on their telegram. Maybe you will recive help faster. But be awere. Lots of scamers are they that write you DM claiming to be admins and asking for keys.