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:
The features.dat file needs to be replaced. The replacement can be obtained here: features.dat Place it at
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.