[Q] Google Keyboard doesn't show up (XT1033) topic

Good morning/afternoon/evening guys.
Yesterday (26/02/15) I was typing and, after I finished, clicked the back button to close the keyboard, but instead of closing, it bugged, leaving the back button facing down, as to close the keyboard, and the mini keyboard of options on the lower left. The device locked, and since I use a letter password, I wasn't able to unlock it. I tried rebooting, but now it doesn't show up, and I can't unlock it.
Today, however, I tried to use the Guest account, and I was able to use the keyboard, so the problem is only with my main user.
What can I do? Hard reset is not an option (for now), since I still need to make a backup.

System info:
Model: XT1033
Android version: 5.0.2
Baseband version: MSM8626BP_1032.3105.93.00R ROW_DSDS_CUST
Kernel version: 3.4.42-g48d3b85 hudsoncm@ilclbld30 #1 Tue Jan 6 16:43:11 CST 2015
System version: 220.21.28.falcon_umtsds.Brasil.en.BR
Version number: LXB22.46-28

Never did modifications, except updating it (OTA) to 4.4.4 and 5.0.2

Thanks in advance.