Thanks for the tip but I have not used bulk load, only factory loaded cassettes but I will check the DX encoding on the Silvermax to see if there is a problem.
Silvermax has no DX code and cannot be used in autmatic cameras which require a DX code.

The reason behind this is that at present the MOQ for DX coded cartridges is 150.000 pce. per type.
Since only a very small share of the market is affected we had to let this market share slip.
Instead we use the same cassettes for all speeds and overlabel the DX code.
This will be more and more common with other manufacturers as well in the future. Paying for and stocking 300.000 casettes (if you need two different codes) is prohibitive at current sales levels.
We offer DX labels in our webshop as a fix: