Description:
Some standard masters show a blue background when one switches between masters multiple times. No other features of the selected master slide are visible.
See also screenshot.

See steps to reproduce below.

I can reproduce similar behaviour with these masters:
- Portfolio
- Forestbird
- Lush Green
- Blueprint Plans
- Nature Illustration

Reproduced with these versions:

Version: 6.0.3.2
Build ID: 8f48d515416608e3a835360314dac7e47fd0b821
CPU threads: 4; OS: Linux 4.9; UI render: default; VCL: gtk2; 
Locale: en-US (en_US.UTF-8); Calc: group

Version: 6.0.4.1
Build ID: a63363f6506b8bdc5222481ce79ef33b2d13c741
CPU threads: 4; OS: Linux 4.9; UI render: default; VCL: gtk2; 
Locale: en-US (en_US.UTF-8); Calc: group

Did not occur with this version:

Version: 5.2.7.2
Build ID: 1:5.2.7-1+deb9u4
CPU Threads: 4; OS Version: Linux 4.9; UI Render: default; VCL: x11; 
Locale: en-US (en_US.UTF-8); Calc: group


Steps to Reproduce:
1 Open LO Impress to create a new presentation
2 Chose Alazarin master in "Select a Template" dialog
3 Switch slide to Forestbird master
4 Switch slide to Alzarin master again
5 Switch slide to Forestbird master again
-> Color of current slide becomes blue and does not look like Forestbird

Actual Results:  
-> Color of slide becomes blue and does not look like Forestbird

Expected Results:
Slide master Forestbird is applied


Reproducible: Always


User Profile Reset: Yes



Additional Info:
See also screenshot


User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0