Mouse cursor really frequently vanishes

Solution 1:

Looks like a someone had this issue as well and accept the answer here : Fix invisible cursor? :

If your mouse cursor has mysteriously disappeared in OS X, try the following tricks in descending order to bring it back:

1. Hit Command+Tab to switch back to the Finder or to another app, then switch back to the active app

2. Summon the Force Quit menu by hitting Command+Option+Escape, there is often no need to actually force quit anything as just summoning the menu is often enough to make the cursor return

3. Quit and relaunch the app, or quit all apps if the cursor is gone everywhere

4. Adjust the size of the cursor, found in System Preferences > Accessibility > Display to make it reappear

Reboot

Also, he commented that :

Slightly increasing the cursor size in system preferences seems to have fixed the issue entirely.