Transmission?, weird question/prob Options

[psyko]

Ok so when i'm driving my car does this really weird thing, when i'm shifting from first to second. I will have the clutch all the way in, and it will act like it's not even in at all like when i go to shift i can't put it in second, and i end up slamming it cruching the gears, it sucks ass, and it makes this horribile sound. it only does this VERY rarely, it did it tonight while i was racing. it has done it when i'm just driving normal too. I don't know if it's a tranny prob or what but i just had my clutch replaced like a month ago and it's great, no slipping or anything. i can only recall like 3 times it's done it, it's very strange and kinda hard to explain, but anyone know what this is?

[Consynx]

try rev-matching.

everything i say is guesses because i am auto, and only have knowledge of manuals
but,
could be synchros or could be the gear...
theoretically it should be able to be both, fi the sychros are worn, and you kept slipping into 2nd it could have grinded the grooves at the edge.

but i'd guess Synchros since you were racing when it happened last...