Annoying glitches over cursor while editing formulas

I’m not sure if this is a problem with LibreOffice itself or with my UI setup, but while editing formulas on Calc this “other cursors” are statically printed on the screen, and then everything is harder to identify.

image description

Why does that occur?

Just in case, my video driver configuration:

$ lshw -numeric -C display
       description: VGA compatible controller
       product: 2nd Generation Core Processor Family Integrated Graphics Controller [8086:126]
       vendor: Intel Corporation [8086]
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:33 memory:e0000000-e03fffff memory:d0000000-dfffffff ioport:3000(size=64)

I’m on Arch Linux using packages xfwm 4.12.2-1, xorg-server 1.17.1-5 and libreoffice-frash 4.4.3

there have been some rendering difficulties in development versions associated with KDE (see recent bug report and internally linked reports). Unaware if they go back into 4.4.3. Are you using KDE?