I’m also having problems with insync-1.5.2.37346-fc25.x86_64.rpm on Fedora 28.
The GUI won’t start and puts 1 of 4 processors constantly running at 100%. I have to kill it manually. It did start once (when I installed 1.4.5.37069-fc25) but then never again. Just in case this helps:
ldconfig -p | grep -i gl.so
libwayland-egl.so.1 (libc6,x86-64) => /lib64/libwayland-egl.so.1
libwayland-egl.so.1 (libc6) => /lib/libwayland-egl.so.1
libwayland-egl.so (libc6,x86-64) => /lib64/libwayland-egl.so
libobs-opengl.so.0 (libc6,x86-64) => /lib64/libobs-opengl.so.0
libftgl.so.2 (libc6,x86-64) => /lib64/libftgl.so.2
libcogl.so.20 (libc6,x86-64) => /lib64/libcogl.so.20
libQt5OpenGL.so.5 (libc6,x86-64) => /lib64/libQt5OpenGL.so.5
libQtOpenGL.so.4 (libc6,x86-64) => /lib64/libQtOpenGL.so.4
libOpenGL.so.0 (libc6,x86-64) => /lib64/libOpenGL.so.0
libOpenGL.so (libc6,x86-64) => /lib64/libOpenGL.so
libGL.so.1 (libc6,x86-64) => /lib64/libGL.so.1
libGL.so.1 (libc6) => /lib/libGL.so.1
libGL.so (libc6,x86-64) => /lib64/libGL.so
libEGL.so.1 (libc6,x86-64) => /lib64/libEGL.so.1
libEGL.so.1 (libc6) => /lib/libEGL.so.1
libEGL.so (libc6,x86-64) => /lib64/libEGL.so