If I have an ILS freq. tuned, I only get the glideslope indicator on the ND if the EFIS is set to APP mode on my downwind leg for landing.

 

 

I circled in yellow the two areas of focus.

On the ND, the glideslope shows I'm just passing under the beam, but on my PFD (or the FO's PFD) the dot is missing from the glideslope area.

The localizer shows up fine, but not the GS.

 

I notice this on every approach I do. Is this something the real airplane models? Or is there something wrong with my installation?

I don't know if it matters, but in this screenshot I was doing laps around KEDW, with my NAV 1 & 2 radios set to 110.10 and a course of 223 degrees for both the Capt. and FO course windows.

 

What's funny is when I've captured the localizer, a short time later is when the GS dot finally shows up on the PFD, although in the ND (in APP mode) it's been showing the whole time.

Same here & perfectly normal behaviour...from the FCOM:

 

PMDG-NGX-FCOMv2 1.11.17 (pp531)

 

Glide Slope/Glide Path Pointer and Deviation Scale

 

[Option - IAN]

 

The pointer:

 

•indicates glide slope/glide path position.
•in view when the glide slope signal is received or IAN approach is selected.
•fills in solid magenta when within 2 ½ dots from center.
•the pointer is not displayed when the track and the front course on the mode control panel differ by more than 90 degrees (backcourse).

 

PMDG-NGX-FCOMv2 10.11.43 & 10.11.44 (pp 557-558) discuss the ND in APP Mode & there is no mention of the criteria above regarding the Glide Slope/Glide Path Pointer.

Yup.  The pointer appears on the PFD when you turn toward the glideslope right?

First things first: Compare your current heading to the course you've entered; it's 180 degrees out.