So, PC or Mac? Which OS? number of game versions with this bug? Any other keys work perfect in game? Any other games on this engine works perfect?
Haaa! Sorry, I completely failed to include any useful info:
Windows PC (there's not a Mac version posted that I was aware of anyhow); Current version (0.5.1) listed in OP as well as a previous version I realized I'd downloaded a couple weeks or so ago but hadn't launched (0.5.0). I'm using the regular old RPG Maker VX Ace from the website (demo, since I'm not shelling out cash for that and I didn't feel like dredging up a torrent for the thing).
The issue is consistent, It's not so much that I "can't" move, it's that the character is "forced" to move upon any directional input. Once the game allows me to move, if ANY directional key is used the character will automatically start moving left, occasionally moving up when other directions are pressed, but never the direction I'm inputting.
Feels like a weird auto-run script.
I thought it might've been my keyboard since it can act as a gamepad with analog inputs (can swap on the fly), so I disabled any option for it to use that and it resulted in the same exact issue.
I'm unaware if this is persistent across all RPG-maker titles since I haven't tried any out.
***EDIT***
Found a workaround. Apparently it's a relatively known and prominent glitch with RPGmaker throughout multiple iterations. Hilarious they haven't fixed this... some keyboards seem to not play nicely with RPGmaker, constantly registering "holding" up and left arrow keys. Unplugging my keyboard, launching the game, then plugging it back in did the trick.