Heptavolt

I am working on a game with movement similar to Fire Emblem. The movement is on a grid and creates a path of short grid-sized segments based on the start/destination. For whatever reason, when the path ends (endaction = stop at end) there is occasionally a very minimal left over speed that throws off the x,y values. It seems to only occur with certain grid spaces, going certain directions (the move can be "cancelled" following the path backwards at a different speed). Is this a GM error? Or did I do something wrong? (PS the problem can be fixed by rounding the values off after the fact, but obviously I would prefer to have it stop when it is supposed to)

I've had a problem where I delete a background and it throws off the id number of the rest of the backgrounds. I was calling them (by resource name) to use as textures and the game would use the wrong texture. I was wondering if there is a way to have GM recount the resources and assign new numbers?

Kinda lame, but I can't seem to find where I'm supposed to upgrade my registration key. Does anyone have a link? I'd like to move my 6.1 key up to 8.1, or at least up to 7.

I've exported a number of MIDI files from FL Studio and once I put them into GM all of them have a pause before they loop. It occurred to me that I may not have set the remainder setting to cut, so I will try that but I believe I've tried that before. Has anyone run into a similar problem? (and hopefully found a solution!)

I was wondering if anyone knew of any free software that can handle multiple wave tracks? I'm trying to take a clip, invert it, and use it to cancel out part of another clip but the free software I've found so far doesn't allow precise enough shifting of the individual audio tracks. Ideally I want a software that can handle .mp3, but just .wav is fine if anyone knows where to find it. Thanks!