I checked, and liblinuxsampler-3.dll is there in the program's install folder. In SONAR, the error message pops up when trying to insert linuxsampler as a synth instead of during DAW startup.The program can't start because liblinuxsampler-3.dll is missing from your computer. Try reinstalling the program to fix this problem.
I have tried most of the linuxsampler Windows binaries from 20120610 to 20121004 to no avail. The standalone version works just fine (tested using JSampler). This problem happens both on my desktop and my laptop, but I have yet to find any info online about anyone else having this issue. Am I really the only one having this problem? On two computers?