Created attachment 166081 [details]
Use this to reproduce.

No issue with
Version: 7.0.0.2
Build ID: c01aa64b6c3d89ebe5fe69c28c7adb24eb85249c
CPU threads: 4; OS: Mac OS X 10.12.6; UI render: default; VCL: osx
Locale: nl-NL (nl_NL.UTF-8); UI: en-US
Calc: threaded

Assume a Skia problem, but likely fixed

Works fine for me in

Arch Linux 64-bit
Version: 7.0.1.2
Build ID: 00(Build:2)
CPU threads: 8; OS: Linux 5.8; UI render: default; VCL: kf5
Locale: fi-FI (fi_FI.UTF-8); Käyttöliittymä: fi-FI
=7.0.1-1
Calc: threaded

Mihai: please copy and paste here the contents of your Help - About. This allows us to know more about your system.

Set to NEEDINFO.
Change back to UNCONFIRMED after you have provided the information.

(In reply to Telesto from comment #3)
> Assume a Skia problem, but likely fixed

Can't be a Skia problem as this is reported on Linux.

For me it reproduces constantly.

Here is the about info:
Version: 7.0.1.2 (x64)
Build ID: 7cbcfc562f6eb6708b5ff7d7397325de9e764452
CPU threads: 8; OS: Windows 10.0 Build 19041; UI render: Skia/Raster; VCL: win
Locale: ro-RO (ro_RO); UI: en-US
Calc: CL

Since reporter is Windows, I change that here. I may report Linux separately. 
I reproduced some problem with LO 7.0 Skia but not with master LO 7.1+.

Mihai, please do (always when reporting bugs, in addition to writing exact version from Help-About):
1. User Profile Reset (or rename);
2. test daily master from https://dev-builds.libreoffice.org/daily/master/current.html, it installs separately. 

Note that we have separate bug 91456.

Resetting the user profile didn't help. The same hang&crash.

Trying 7.1 alpha works, no hangs, slideshow plays properly, but when exiting the presentation Impress crashes and then it does not open again untill I delete the user profile directory.

Created attachment 166117 [details]
Here is the crash from LO 7.1 when exiting the slideshow

ProductName=LibreOffice
Version=7.1.0.0
BuildID=f90500754fac014638214b5e061832b2c518aab6
URL=https://crashreport.libreoffice.org/submit/
UseSkia=true
Language=ro-RO
ShutDown=true
DumpFile=C:\Users\Mihai\AppData\Roaming\LibreOfficeDev\4\crash\20e9a174-a1cc-4896-81a6-db935032751a.dmp
GDIHandles=134

Not reproduced in

Version: 7.1.0.0.alpha0+
Build ID: a9976a958b2857e308c6598532151878615bfd9f
CPU threads: 4; OS: Linux 5.7; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
Calc: threaded

(In reply to Timur from comment #9)
> I don't reproduce crash on exiting slide show.
> I reproduce crash on loading slideshow sometimes, only on 1st run, even in
> 7.1+.

why is it 'high' if you can not even reproduce it ?

Created attachment 166196 [details]
gdbtrace.log

I'll confirm the crash, repro in Windows on 1st time load. 
Interesting it doesn't happen on subsequent LO exit and run for me. 

Previously I had crash in Linux GTK3 and Skia, no repro GEN.
No crash in LO 5.3 bibisect master, crash in 5.4.

I also had a crash with debug 7.1+. Here is GDBtrace.

Crash is not normal nor medium.

Upgraded today to LO 7.0.2.2
Version: 7.0.2.2 (x64)
Build ID: 8349ace3c3162073abd90d81fd06dcfb6b36b994
CPU threads: 8; OS: Windows 10.0 Build 19041; UI render: Skia/Raster; VCL: win
Locale: ro-RO (ro_RO); UI: en-US
Calc: CL

The presentation does not crash anymore on opening, but I can reproduce the crash every time when pressing escape to close the presentation after a couple of slides.

Bug does not reproduce anymore in build
Version: 7.4.1.2 (x64) / LibreOffice Community
Build ID: 3c58a8f3a960df8bc8fd77b461821e42c061c5f0
CPU threads: 8; OS: Windows 10.0 Build 22000; UI render: Skia/Raster; VCL: win
Locale: ro-RO (ro_RO); UI: en-US
Calc: CL