The game was create with 1.5.7

I had a blockaded trade route on galaxy view, the path goes through the academy's systems.

My status with Academy is neutral.

But on economy screen, I have no blockade...

Here is my current save:

QuickSave.sav

Yeah i have troubles with the trade routes as well.

constantly happens on many my games too,  once the trade route is blockade once, I have a blockaded trade route on galaxy view for the rest of the game, even if it not actually blockade anymore and on economy screen have no blockade.. I think is a visual bug..

Yes, the bug's purely visual, luckily. Unfortunately I haven't heard anything about a fix for this particular issue.