Hello.

I did several diversions past several days and I noticed when I changed destinations I cannot add or change alts and speed in CRZ, DES and LEG pages. For example if I try to add alts constrain and type /250 or /FL250 or 250 I see numbers changes in the scratch pad from 2 thru 5 and at the end I see only the last digit I have typed like 0, not 250. I am wondering if this is a bug or there is something else. 

Thanks 

Several diversions in same flight?  Let's back up the story and include more detail into how you changed destination, and how you were modifying the route.  It is possible to 'jam' the FMS but not very likely and it is rarely reported here.

Thanks for the reply downscc.

I didn’t say I diverted in the same flight. I said I did several diversion past several days. I was flying from EGLL, EKCH, EHAM, ESSA to LOWI. It was foggy in LOWI so visibility was below mins so I couldn’t legally land. 

Procedure: 

Entered diversion airport in: ACT RTE 1/X, DEST> (LSK 1R) and EXEC

Entered route to the diversion airport: ACT RTE 2/X (or X/X) and ACT RTE LEGS 1/X and EXEC

While diverting, ensure the T/C has been reached or change cruise altitude to aircraft altitude (FMA VNAV PTH).

Finally, define an end of descent point by selecting an Arrival/Approach for the diversion airport.

Use Route 2... or the ALTN menu. I‘m not at the FMC right now but I don‘t think that messing with the actual areival airport in the active route will work out.

We don't have the FMS version software that has RTE 2.

I think he was referring it to 777