There's a new entry on the FAQ page that describes what to do when the CLAP resamples a filter spot. Power interruptions or uncontrolled shutdowns occasionally cause the CLAP to restart sampling on spot #1, even though the filter was not changed. If this happens, the transmittance values after the restart will be incorrect, causing the Bond or CTS corrections to return invalid values. The easiest way to deal with this problem is to invalidate the CLAP data for the time period after the restart until the filter was changed. The CLAP data on a re-sampled spot are, however, recoverable, and you can use the data editing tools to correct the data if you need a value for that time period (e.g., during a campaign). See the FAQ for further details.