First of all the process does work but their are some windows that can not be restored. With that said.....
Now, those windows that were restored In the corners you should find what we In the business call valves. Valves control air flow, air has moisture, within the window allowing moisture to get out at the same time controlling the moisture from getting In. If I have It correct you still have foggy or condensation problem. If that Is the situation then the only thing that It could be are those valves. In that case remove the valves with your finger nail and the problem Is solved. The only reason for those valves are to control air flow, air has moisture, and to keep bugs out.
To solve the bug problem just get clear tape something like 'Scotch Tape' cover the hole then take a SHARP needle poke tiny holes,10-12, to allow moisture to escape and to keep the bugs out. FYI the Scotch Tape will fade in texture and will be noticeable In time. Their is a specific product for this It's call a 'plug'. On line find someone In the business to sell you those 'plugs'.
Send me all the info on the company that you hired and I will tract them down for you.