Lookout closing

Hi,

we are using Lookout 6.7 from many years. Since last weeks, we are doing some updates in our process in a development license.

Each time we try to close the development software after some changes, the closing “stops” and we can see that the software is not responding. We force the closure, then reopen it and everything  looks good, all modifications are saved; we are just not able to close it normally. If we do no modification it closes normally, but at the moment we move something, it doesn’t close normally.

 I tried with an old backup and the problem doesn’t occur.

So I am wondering if somebody know where I need to look to fix it, where we did a mistake.

Thanks