Unfortunately, Sigmira has developed a problem of unknown origin. Here, STANAG 4285 simply stopped working. Clicking the button in the menu did nothing. Others have had an error message relating to a "control window not available," even though it had been available the last time the program was run.
The programmer is aware of the issue and has a fix that has so far worked for myself and everyone I know of who has done it. It is necessary to replace a config file in Sigmira's home folder called features.dat so that the missing features become available again.
Go to (Sigmira's web page), and scroll down. You'll see the following:
2010/1/26
The features.dat file needs to be replaced. The replacement can be obtained here: features.dat Place it at/bin/features.dat.
Click the link (which will be available on the web page) and replace the defective features.dat in the directory mentioned. Start up Sigmira and watch it work right.