Mapster32 texture browser shows white boxes in rendermode 4

Texture browser (v key) looks like this in rendermode 4 (polymer) on the laptop I've been using for this stuff.

Looks fine in other modes. Seems like a bug, but is this something I should try to fix on my end by tweaking some r_* settings?

Here's some info on this laptop:

OS Name	Microsoft Windows 10 Home	
Version	10.0.18363 Build 18363	
System Manufacturer	Dell Inc.	
System Model	Inspiron 5545	
System Type	x64-based PC	
Processor	AMD A10-7300 Radeon R6, 10 Compute Cores 4C+6G, 1900 Mhz, 4 Core(s), 4 Logical Processor(s)	
BIOS Version/Date	Dell Inc. A02, 6/17/2014	
SMBIOS Version	2.8	
Embedded Controller Version	1.01	
BIOS Mode	UEFI	
BaseBoard Manufacturer	Dell Inc.	
BaseBoard Product	0D5TC7	
BaseBoard Version	A00	
Platform Role	Mobile	
Hardware Abstraction Layer	Version = "10.0.18362.752"	
Installed Physical Memory (RAM)	8.00 GB	
Total Physical Memory	6.94 GB	
Available Physical Memory	3.59 GB	
Total Virtual Memory	8.87 GB	
Available Virtual Memory	5.06 GB	
Page File Space	1.92 GB