Trouble loading custom font files

All is well without any additional code:

xÄ.¯xÄx¿JôX.x:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5828
entry 0x400806a8

SPIFFS initialization succesfull
================================

With fontsLoaded() it’s not so well:

xÄ.¯x¿.(&R|êóǬ¡0,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5828
entry 0x400806a8

SPIFFS initialization succesfull
================================

fontsloaded: 32770

It starts getting messy with only: pTft->loadFont(“SansSerif36”, true); in place:
fillScreen() doen’t work anymore.

xÄÿ.Q.àH.b≠}ë…ŸÈ0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5828
entry 0x400806a8

SPIFFS initialization succesfull
================================

Font file SansSerif36 not found!

Things are really bad with only: pTft->loadFont(“NotoSansBold-36”, true); in place:
No output on the TFT screen.
Serial printer repeatedly prints:

xÄ.¯xÄ..D∞úRΩë.Çbä}ë…ŸÈ0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5828
entry 0x400806a8

SPIFFS initialization succesfull
================================

Guru Meditation Error: Core  1 panic'ed (StoreProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x400d2950  PS      : 0x00060930  A0      : 0x800d30e4  A1      : 0x3ffb1f00  
A2      : 0x3ffb9548  A3      : 0x00000000  A4      : 0x001bfffc  A5      : 0x00000000  
A6      : 0x00000000  A7      : 0xff000000  A8      : 0x800d294e  A9      : 0x3ffb1ee0  
A10     : 0xffffffff  A11     : 0xffffff00  A12     : 0xffff0000  A13     : 0x3f4081c8  
A14     : 0x3ffb984c  A15     : 0xff000000  SAR     : 0x00000019  EXCCAUSE: 0x0000001d  
EXCVADDR: 0x00000000  LBEG    : 0x4000c28c  LEND    : 0x4000c296  LCOUNT  : 0x00000000  

ELF file SHA256: 0000000000000000

Backtrace: 0x400d2950:0x3ffb1f00 0x400d30e1:0x3ffb1f20 0x400d10c5:0x3ffb1f70 0x400d4686:0x3ffb1fb0 0x400863c1:0x3ffb1fd0

Rebooting...
ets Jun  8 2016 00:22:57

I’ve checked that all custom font files are in place using and Arduino sketch.
Strangely enough on PlatformIO it only reports:

SPIFFS initialization succesfull
================================

---Dir: /:
FILE: /NotoSansBold-36.vlw

So; what might be going on here?
StoreProhibited; which store?