Hi there
Perhaps the update changed your default app preference to stock gallery.
If that's the case, you could try going to Settings - Application Manager. View ALL, and look for gallery. Clear Default.
Make a photo with your camera, and right after that, go to preview that photo It should be asking you to choose the default app to view it. Select Quickpic from the list and set to ALWAYS.
There is a chance the "default" application might be grayed out, being used by some other app. To try forcing a default app selection box to pop up, you could try opening a photo from SD card, using file explorer app (My Files), and then set Quickpic as default.