Labview block diagram icons became invisible

[shinebayar@jbnu.ac.kr]

I have been working on a rather large top-level vi for quite a while when suddenly several system vi's have developed display problems.  In particular, all vis from the FPGA module no longer appear on the block diagram.  They are there, because I can move them, set properties and wire to them, but they are invisible.  Even if I add a new one from menu, it is invisible.  The same is true for the controls block on the timed loop structure.  The loop is visible, but the controls are not.

I attached an image of part of the vi which shows what should be an "open FPGA reference" and a timed loop.  As you can see, the wire are connected, and it compiles and runs fine, but there is nothing on the screen

It is specific to this vi.  If I create a new vi and add the same vi's they look fine.  As far as I know, I did not make any changes to any display settings.

I am using LabVIEW 2018 Professional Development System

 

[GerdW]

Hi shinebayar,

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shinebayar@jbnu.ac.kr wrote:

I have been working on a rather large top-level vi for quite a while when suddenly several system vi's have developed display problems. 

…

It is specific to this vi. 

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Either this specific VI went "insane" (yes, that's the term NI uses) or "its block diagram is too large". As you have the VI you can decide on these two options.

Solution: get a working VI from your backup or (even better) an older revision from your SCC system.

You use a SCC tool (or just backups), don't you!?