I'm not sure if this has happened to anyone or just me. Or is anyone knows why and how to fix it. Frankly that would be very useful for me. But, whenever I try to any multiplayer server with 1.9, it logs me in, and as soon as i'm it it takes me to the chatlog and shows the screen when a java error occurred. So, if knows why and how i could fix it, please let me know. My birthday is tomorrow and i was hoping to have another great and heartwarming birthday on MCS.
All I can think of is that there's an issue with your client. You could try deleting and reinstalling minecraft. If you do this however, you may want to save your maps and screenshots.
Could you paste the content of the file found at C:\Users\Gabby\Appdata\Roaming\.minecraft\hs_err_pid6872.log inside spoiler brackets? But from what I can see in there it looks like a javafile is acting up.