bug is still present in 6.17. Assuming *.exe is a blocked dcc send filetype, the stalled send window remains open after the get window is rejected:
//var %x = $str(x,75) $+ .exe | write %x test | dcc send $me %x | window -n "send $me %x $+ "
* /window: invalid parameters
74 is the largest value i can use in 6.17 without the error, while my 6.16 correctly handles values up to 73.
Both mIRC foldernames are 4 characters in length.