Hello Georges,
You may run the C1 installers with 'Repair’ option to repair and readd the C1 toolbar option.
However, as you are saying that you are frequently getting the 'LC.exe’ error, could you please let me know few more details :
1. Is this issue occuring only on one machine or on all your developer machines?
2. What is the machine configuration and VisualStudio version ?
3. Which C1 products (along with versions) are you using in your application and are there any specific steps that you make after which this error is reproduced?
4. Are you using licensed or unlicensed version of our controls?
Thanks,
Richa