Operating system: Linux-5.1.14-arch1-1-ARCH-x86_64-with-arch 64 Bits
Graphics card: GeForce 8400GS/PCIe/SSE2 NVIDIA Corporation 3.3.0 NVIDIA 340.107
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-10 09:16, hash: rB8aa87972cac3
Short description of error
2D cursor appears when trying to select curve strokes
I'm using left click select.
Exact steps for others to reproduce the error
In texture editor (Paint mode) you start adding a curve with the Stroke > Curve to draw a path, when you hold shift while right click select over the handle to keep proportion it moves, but it won't let you move the path handles anymore, instead it will move the 2D cursor to the position of the mouse.
This will back to normal if you re-open the blend file.