When creating new folder using the F7 or FC context menu, the name of the folder containing "%" (percent sign) will be changed. The % sign causes change of the % character itself and the two characters that follow it, to one blank character that is invisible and has no size in the width of the line character.
Typing folder name:
will be shown as:
but tere is an character between "3" and "c" that has "occuping" no space:
in Notepad++ it is displayed as:
Whereas after % sign, two characters are specific signs, an error window will be displayed showing the full path containing some of character as if placed by Alt codes (eg. Alt+18 gives ↕). And folder with this kind of filename can not be created.
After renaming the folder, everything works correctly.
I'm working on FreeCommander XE 2020, Build 810a 32-bit public on Windows 10 1909, both "stationary" and portable.