At first run, right click on button bar and click change
add a new button, click search command button,
type "count" and add "cm_CountDirContent"
this error showed up:
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Total Commander 8.0ß12
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TListBox Index 36 out of bounds 0 .. -1.
TListBox Index 36 out of bounds 0 .. -1
Windows 7 SP1 6.1 (Build 7601)
Please report this error to the Author, with a description
of what you were doing when this error occurred!
Stack trace (x64):7C3D14
7C4D59 4BE143 4BFF71 7AEA81 7CA386 7CAADD 8643F5 7CA271
40F31D 7ADA50 7A2153 888DBF 7E00A4 891A02 77719BD1
Press Ctrl+C to copy this report!
Continue execution?
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Yes No
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BTW, I continued execution without any problem (the button was indeed added) and I wasn't able to reproduce the error again
Bye!
Error while changing button bar
Moderators: Hacker, petermad, Stefan2, white
Hello, massm.
This is a known bug. Read here, please: [TC 8.0b12 x64] bug - edit item in button bar. And this thread references other similar reports.
Karl
This is a known bug. Read here, please: [TC 8.0b12 x64] bug - edit item in button bar. And this thread references other similar reports.
Karl
Confirmed fixed in TC 8.0b13 x 64 

License #524 (1994)
Danish Total Commander Translator
TC 11.51 32+64bit on Win XP 32bit & Win 7, 8.1 & 10 (22H2) 64bit, 'Everything' 1.5.0.1391a
TC 3.60b4 on Android 6, 13, 14
TC Extended Menus | TC Languagebar | TC Dark Help | PHSM-Calendar
Danish Total Commander Translator
TC 11.51 32+64bit on Win XP 32bit & Win 7, 8.1 & 10 (22H2) 64bit, 'Everything' 1.5.0.1391a
TC 3.60b4 on Android 6, 13, 14
TC Extended Menus | TC Languagebar | TC Dark Help | PHSM-Calendar
Confirm the fix in T.C. 8.0ß13 64-bit, too.
Windows Server 2003 Std. SP2, 64-bit
Total Commander 8.0ß13 64-bit
Karl
Windows Server 2003 Std. SP2, 64-bit
Total Commander 8.0ß13 64-bit
Karl
MX Linux 21.3 64-bit xfce, Total Commander 11.50 64-bit
The people of Alderaan keep on bravely fighting back the clone warriors sent out by the unscrupulous Sith Lord Palpatine.
The Prophet's Song
The people of Alderaan keep on bravely fighting back the clone warriors sent out by the unscrupulous Sith Lord Palpatine.
The Prophet's Song