Forums Scripts & Popups problem: /background command in ver. 6.3

in ver. 6.3, the /background command doesn't work as in 6.21
and as described in the help section.
Syntax in help:
/background [options] [window] [filename]

in 6.3, I cannot specify a custom window name. for example:
/background @mywindow mypicture.jpg
will cause the error message
* /background: no such file 'C:\path_to_mirc_directory\@mywindow'

any suggestions?

[added later by marco50:]
I experienced another problem just now:
/hadd does not work any more within events (eg on JOIN, on ACTIVE). It will cause the error msg:
* /hadd: no such table 'wnicks'
although wnicks has been created in on START event

Similar behavior with /toolbar within events. eg:
/toolbar -y100 afk
will cause "/toolbar: no such button 'afk'" - although the afk button does exist.