If you can make your project public and share the url to it, we can have a look and see what the trouble might be.

Did you uncheck Ratlines in the layer manager by mistake??

@andyfierman Hi. Thanks. It's super simple, single sided, only 12 components. [https://oshwlab.com/flexiblebird/wagonled](https://oshwlab.com/flexiblebird/wagonled) I completely messed it up and think I should restart. But beforehand I would like to know, why it went wrong. It all worked, I completed the PCB. Than I hit Pin to Pin, the traces went dim, and I was not able to successfully edit it. Back in the schematic I replaced a component with a different one from the library, updated the PCB and all the other components were gone. Once again update tjhe PCB, now every component is duplicated. I already deleted some of them, but some of the duplicated are still placed in the lower right corner. I never thought it is possible to screw up a pcb layout program this way.

@SEKEL Hi. Thanks. Yes, it is still displayed. If I update the PCB from a slightly modified schematic, I get some duplicate components with airwires. I'm still not able to select basic parts in the BOM. The whiteLEDSMD C34499 from KENTO is listed as a basic part and it gets a price of 1.5ct in BOM, but ORDER PARTS/CHECK STOCK than says Discontinued. Other parts are also basic, but the order form says Min.: 100, Mult.: 100. But there are (at least what I found) no smd aluminium electrolytics as basic parts available. No problem, I can solder them later, but how do I specify which parts come soldered and which part not ?

@flexiblebird Hi Sekel. The problem was not, that ratlines/airwires was unchecked, but that it was checked as the editing layer. If I click on to top layer, the editor works.Thanks.

@flexiblebird Download the SMT stock list as an Excel spreadsheet on the JCLPCB website - always check they have the stock... I've had to do last minute re-designs as the stock ran out.

@flexiblebird Great!