Solvers do not work. Even for documentation examples.

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No solvers appear to work properly on my computer. For testing purposes I scalled down everything to the documentation example (https://www.mathworks.com/help/symbolic/solve.html), as shown below.

syms x
eqn = sin(x) == 1;
solx = solve(eqn,x)

This should return pi/2 in a second or so. Indeed, it does for another computer I have tried. However, if I try this on my computer, Matlab is just computing for hours (aka "busy"), while the ram-usage goes up to 10s of GB. And, yet it doesn't return any results - even after hours. I have tried other solvers and examples, e.g. from the documentation of the differential equations and they yield the same result. Matlab is busy constantly. Simple algebraic calculations work without any problems.

I am almost certain, I am probably missing something from the installation, maybe some SDK. I am using Matlab 2017b including various toolboxes (e.g. symbolic toolbox) on a Win10 machine. The other computers matlab version appears to be configured similarly and I can't figure out any difference. Matlab 2018 show the same problmes.

I am running out of ideas, what to try next. Any thoughts on this? It is probably an extremely simple solution. Regards, Michael