Is this fertiliser burn?

[Orchid Whisperer]

You can't really diagnose viruses by appearance alone. If this blooms and the flowers have some malformation or color break, then I would be more suspicious of virus, but the only way to know is through virus testing.

OrchidLoverSA:
The white line on the leaf does look like hard water deposits. The white splotches - not sure. Has there been any light change/ gotten any brighter than usual? I always think sunburn when I see white blotches.